18452421 has 16 divisors (see below), whose sum is σ = 29440320. Its totient is φ = 11355120.

The previous prime is 18452411. The next prime is 18452431. The reversal of 18452421 is 12425481.

It is an interprime number because it is at equal distance from previous prime (18452411) and next prime (18452431).

It is not a de Polignac number, because 18452421 - 2¹⁰ = 18451397 is a prime.

It is a super-2 number, since 2×18452421² = 680983681522482, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18452411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25935 + ... + 26636.

It is an arithmetic number, because the mean of its divisors is an integer number (1840020).

Almost surely, 2^18452421 is an apocalyptic number.

It is an amenable number.

18452421 is a deficient number, since it is larger than the sum of its proper divisors (10987899).

18452421 is a wasteful number, since it uses less digits than its factorization.

18452421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52593 (or 52587 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 18452421 is about 4295.6281263629. The cubic root of 18452421 is about 264.2516969400.

The spelling of 18452421 in words is "eighteen million, four hundred fifty-two thousand, four hundred twenty-one".